Bluetooth Keyboard/mouse on two computers

Pairing an Apple (bluetooth) wireless keyboard with multiple computers

I have found that the following procedure works fine to connect one Apple wireless keyboard with 2 computers (could be done with more).

1. Pair keyboard with computer A
2. Disconnect keyboard (do not remove! only disconnect)
Note: To disconnect go to System Preferences -> Bluetooth -> Select keyboard device and next to the - (minus) sign there is a tools sign with more options one of them being "Disconnect"
3. Switch off keyboard and pair with computer B

And then ... to connect back with computer A:
4. Disconnect keyboard with computer B
Remember do not remove, cos it will mean that next time you need to pair again, entering the digits.
5. Switch off the keyboard (pressing 4 secs)
6. Turn on the keyboard pairing (pressing again the keyboard for 4 secs until the light turns on blinking)
7. On computer A: Go to Bluetooth, select the keyboard and options and select Connect.

and voilà, you don't need to "re-pair" (searching and entering digits) only re-connect.

I have done it and it works with a Mac Mini (Mac OS 10.6 Snow Leopard) and a Mac Book Pro (Mac OS 10.7 Lion)

 

Synergy will let you share your keyboard and mouse across systems on the same network, just move from screen to screen, now without two monitors not sure how it will work, but since it's a laptop, use that screen, and a windows machine use the new screen for it.

http://www.engadget.com/2005/08/09/how-to-share-your-keyboard-and-mouse-in-realtime-with-synergy/

It's an older article, but the software is good, and has been updated.